Jewel-bearing for scales.



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JEWEL BEARING FOR SCALES APPLICATON FILED dCT- 2, I917. I 1,29%554 Patented Jan, 7,1919.

WITNESSES.-

UNITED STATES PATENT n on.

DAVID .J'ANKOWER, OF NEW YORK, N.

JEWEL-BEARING FOB SCALES.

Specification of Letters Patent.

Patented Jan, '7, 1919.

- Application filed October 2,1917, Serial No. 194,334.

To all whom it may concern:

Be it known that I, DAVID JANKOWER, a citizen of the United States, and resident of New York city, in the county of New York and State of New York, have invented certam new and useful Improvements in Jewel- Bearings for Scales, of which the following is a specification.

My invention relates to improvements in jewel-bearings for scale balance ivots for which in the past agate has chiefly been used, andof late, owing to a scarcity of agate, metal alone, which, though greatly inferior for the purpose, has largely had to be adopted. I The object of my invention is: 1st; to again make possible the free use of agate for jewel bearings for scales, and to do so at even a greatly lesser cost than heretofore,

by means of using only a fractional amount of the agate as heretofore required; 2d; to

make it possible also to advantageously utilize more valuable and better jewel material for the purpose such as garnet, sapphire, and ruby, which heretofore could not be employed economically enough because of the quantity of material required for making the jewel bearings a in the past.

I attain the object statecl'by means as.

illustrated in the accompanying drawing.

Figure 1 is a vertical view of the scale balance embodying my improvement; Fig.

2, a perspective view of my improvement,

detached from the scale balance; Fig. 3, perspective view of jewel bearing, detached from block shown in Fig. 2.

Similar numerals refer to similar parts throughout the several views.

' Referrin now to Fig. 1, 1 is a jewel bearing inserted arranged to fit in seat of scalebalance; 3, knife edge steel pivot arranged to rest on As constructed indicated in the present invention by numerals 1, and 2, was made in one piece of agate and the cost of material and the labor in cutting and polishing thelarge surface of the same was considerable;

I I reduce this cost materially by forming the outer part of thecombination block, 1, and2, out of metal or other suitable cheap material, and only use a strip of jewel large enough to serve as a bearing for pivot 3,

previously the entire block,

This stripof jewel is V-sha-ped on its upper surface and is snugly fitted into a slot in metal block 2, which metal block 2, has 7 jewel material andserve to guide the steel pivot 3 into the V-shaped slot at the upper surface of the said strip of jewel material.

To more thoroughly secure the agate to the metal block, it may be coated with cement before being pressed into the slot of-same, and the V-shaped slot of the jewel bearing may be ground to shape after being inserted in the metal block, or may be ground, or only partially ground, before being inserted in the same. As a substitute for metal, rubber or other suitable plastic material maybe used. The rubber in such case should be molded to the agate block or strip and then vulcanized.-

Having now fully described my invention,

' what I desire to claim by Ilnited States in metal block, 2; 2, metal block W patent is L'In a jewel bearing, the combination of a scale balance with a removable metal block to which is secured a strip, or block of jewel 3. The combination of a scale balance with a removable metal block to which is rigidly secured a blockof jewel material, with a slot on its upper surface adapted to hem loose contact'with thevpivots carrying the movable parts of the said scale balance.-

4:. In a 'jewel bearing, the combination of a block of jewel material, having a V-shaped slot on its upper surface, with a metal block surrounding the said agate block on three sides, the said metal block having'its upper surface formed at a. double angle of approximately the same degree as that of the V slot in the jewel bearing.

5; In a scale balance; the combination of a strip of jewel material having a V shaped slot in its upper surface, inserted iii-a block of metal; the said block, of metal being 2' intgral with the said strip of jewel ina- New York and State of New York this the er A. D. 1917.

terial, and both together forming a block 151; day of 001301) adapted to fit into the bifurcated top of a, DAVID JANKOVVER. supporting rod in connection with raflscaler- \Vitnesses:

5 balance. JAMES HART ROBERTSON,

Signed at New York city in the county of GEO. EMRICI-I. 

